Door-latch.



, PATENTED 13130.10, 1907. J. H. STRATTON.

DOOR LAT APPLICATION FILED PEB.13,1906.

UNITED STATES JOHN H. STRATTON, OF HOLYOKE, MASSACHUSETTS.

DOOR-LATCH.

Specification of Letters Patent.

Patented Dec. 10, 1907.

Application filed February 13. 1906. Serial No. 300.840.

To all whom it may concern:

Be it known that 1, JOHN H. S'lR-ATTON, a citizen ofthe United States of America, residing at Holyoke, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements in Door- Latches, of which the following is a specification.

This invention relates to the class of doorlatches and indicators therefor.

It has for its object to provide a structure so that the location of the latch on the inside of the doorwill be directly indicated to any one on the outside and thereby furnish him with information as to whether the door is locked or unlocked.

In the drawings forming part of this application,Figure 1 is a longitudinal sectional view through the door and casing and a por tion of the casting supporting the latch and indicator. Fig. 2 is a side view from the interior of the room of the improvement showing in dotted lines the latch lifted. Fig. 3 is a vertical sectional view on the line 33 of Figs. 1. and 4. Fig. 4 is an elevation of the indicator on the outside of the door.

Referring to these drawings in detail, a designates the door, I) the casing, c the plate or casting secured to the door by the screws 0 and having a boss d with an inclined surface e; f designates the latch to which is sef in place and preventing an intruder from cured the shaft 9 extending through the door a carrying at its outer end the disk h. Said shaft 9 may be made in two parts and connected by a key t. y' designates the knob for raising and lowering the latch f into and out of the retaining piece it secured to the door-jamb. On this retaining-piece 7c is a boss or enlargement m for locking the latch rotating the disk h from the outside and lifting the latch f. The inclined surface 6 normally draws the latch f towards the door and and thus keeps the latch under the boss m.

- To raise the latch the operator, by slightly pulling outward on the knob j against the spring tension of the latch f itself, can readily disengage the same from under the boss m and thus lift the latch to the dotted line position f n 1s a plate countersunk into the door a and projecting over the edge of the disk It, as

shown at 0, for preventing a person on the outside of the door from inserting a sharppointed instrument into the edge of the disk It and rotating the latch so as to lift the same and gain admission to the room.

1) designates a groove or channel cut in the face of the disk It for indicating the position of the latch f. When the latch is in a locked position the groove p will stand horizontally (see Fig. 4) and when the latch is rotated the groove stands in the dotted line position. This groove p is also a means of enabling one in the night time to determine the location of the latch by placing the hand in the groove.

Having thus described my invention, What I claim and desire to secure by Letters Patent of the United States, is 1 In a locking and indicating mechanism for doors, a shaft extending through the door and carrying the indicating element on its outer end, a locking element secured to the shaft, means for operating the locking element from the inside of the door whereby the indicating element and locking element are moved in unison, and spring-actuated means for retaining the locking element in its locking position comprising an inclined surface, as e, on the boss (1 for drawing the latch inward toward the door, whereby the indicating element is normally held in a locked position, as described.

JOHN H. STRATTON. 

